Die head



July 23, 1929. A. F. BRElTl-:NSTEIN DIE HEAD Filed May 21. 1926 v 2 shets-sneet 1 o JK Patented July 23, 1929.

UNITED sTATEsF i 1,721,854 PATENT OFFICE.-

ALBERT E. BREITENSTEIN, vOE NEW HAVEN, CONNECTTCUT, AssIeNoR To THE GEO- METRIC TOOL Co., OE NEW HAVEN, CONNECTICUT, A CORPORATION.

DIE HEAD.

Application led May 21,

Fig. 1 is a view in side elevation of a diehead embodying my invention;

Fig. 2 is a view thereof in transverse section the line 4 4 of Fig. 5 is a view of the die-head in centralA 1 longitudinal section, showing the fixture asv closed, preparatory to a threading operation; Fig. 6 is a corresponding view, showing the parts in the positions due to them at the conclusion of a threading operation and at the instant of the disengagement of the' locking-segment from the operating-sleeve and before the same has been moved rearward, which will instantly follow;

Fig. 7 is a detached view in rear elevation of the tripping-sleeve; Fig. 8 is a corresponding view of the operating-sleeve; and

Fig. 9 is a detached perspective view of a modified form of my intermediate or transmission trip-member.

My invention relates to an improvement in self-opening die-heads,`the object being to produce a simple, effective and durable fixture constructed with particular reference to its provision with sensitive and therefore responsive means for tripping it.

With these ends in view, my invention consists in a self-opening die-head characterized by having a rotary, bodily-movable transmission-member interposed between its lockingmember and its tripping-sleeve.

My invention further consists in a die-hea characterized as above and having certain other details of construction as will be here-l inafter described and pointed outl in the claims.

In carryingl out my invention, as herein shown, I employ an intermediate or transmission trip-member 10 in the form of a ball having bodily and rotary movement in aradial passage 11 formed in the rear portion of an operating-sleeve 12 having rectilinear movement upon a skeleton die-head body 13. The said ball projects outwardlyinto a shallow notch 14 having an inclined forward wall 15 and leading out of the inner periphery of the rear end of a tripping-sleeve 16 having rectilinear movement upon the operating-sleeve 12 aforesaid. The rear end of the said sleeve 16 is provided with an annular groove 17 de- 1926. Serial No. 110,789.

signed to receive a yoke or other suitable abutment properly located in the machine in which the die-head is used in the ordinary manner, and not shown herein. The said ball 10 rides upon and co-acts directlywith the periphery of a radially-movable locking-segment 18 located in al circumferential groove 19 inthe adjusting-ring `20 of the die-head, the said ring being internally threaded, as usual, for being screwed upon the threaded portion of the tubular shank 21 of the die-head body 13. f

Diametrically opposite the locking-segment18 and in the same groove 19, I locate a stationary complementary filler-segment 2'3 having neither radial nor endwise movement, and formed in its ends with notches 24 receiving helical springs 2,5 respectively abutting against the ends of the locking-segment 18 and exerting a constant effort to move the same radially outward for the engagement of o its forward outer edge 26 with an abutmentshoulder 27 formed by the forward wall of an eccentricv groove 28 leading outof the inner peripheryof the operating-sleeve 12.

To prevent the relative rotation ofthe operating-sleeve 12 and the die-head body 13, the said sleeve is provided at opposite points in its forward face with twov guide-pins 29 en-` tering corresponding holes 30 in the body 13, the said pins reciprocating back and ,forth in the holes as the sleeve is moved back and-forth lin the operation of the fixture. f

For the self-opening'action of the die-head, I employ two helical springs 31l (Figs. 2 and 4) located opposite each other and extend- Y ing at their opposite ends into deep bores 32 in the operating-sleeve 12 and into complementary bores 33 in the body 13.

As herein shown, my improvedl die-head is provided with radially-movable chasers 34: respectively located in radial grooves 35 in the forward face of the body 13. Spring-actuated plungers 36 exert a kconstant eort to move the chasers outward, so that their beveled outer ends 37 will engage with bevel-s 38 in the inner edge of the outer end of the operatingsleeve 12 (Figs. 5 and 6'); But the specific character of the chasers and the mode of mounting and operating them has nothing to do with my present invention, since so far as my improved tripping-mechanism is concerned, `it may be used in self-opening dieheads furnished with chasers of different construction, mode of mounting andoperation.

As shown in Figs. 1 to 5 inclusive, my im- 1 so y no I v34@ in their cutting positions against the tension of their spring-actuated plungers 36, and the sleeve 12 against the counter-urge of the helical springs 31, the said plunger-s tending to move the chasers outward and the said springs tending to move the said sleeve rearward. At this time, also, the tripping-sleeve 16 is at the limit of its forward movement, as

shown in Fig. 5. f

At a Lpredetermined point in the threading operation, during which the die-head is moved toward the work, the tripping-sleeve 16 is arrested by the yoke or other suitable abutment set in theusual and well-known manner according to the character of the work to be done, in the machine in which the die-head is being used.v `When the tripping-sleeve is thus arrested, the ball 10 being carried forward with the die-head is forced in w'ard'by its engagement with the inclined forward wall 15 of the notch 14 in the tripping-sleeve 1G now at a standstill, with the effect of transmitting its bodily inward movement to the lockingsegment 18, Vwhich in turn is forced radially v inward, so as to disengage its forward outer edge 26 from the abutment-shoulder 27, vas shown in Fig. 6. The springs-31 now assert themselves to lmove the loperating-sleeve 12 rearwardly with respect to the body 13, so as to permitvthe chasers 34 tobe moved radially outward, away from .the work, by their spring-actuated plungers 36. It is to be noted in this connection that when the ball 1() is being moved radially inward, it is free to have rotary as well as bodily movement, resulting in an exceedingly sensitive and vresponsive action between its tripping-sleeve 16 and the Y locking-segment 18 or whatever elsemay take the place thereof, there being no opportunity for cramping or undue wear. l y y Instead of using a. transmission-member in the forni of a ball 10, I might substitute therefor a roller 39, as shown in Fig. 9, arranged to have rotary as well as bodily movement.

I claim: y

1. A self-opening die-head having a body, chasers, an operating-sleeve therefor having a radial passage, a locking-member for holding the said operating-sleeve in position for maintaining the chasers in their cutting positions, a tripping-sleeve mounted ,upon and axially movable over the said operatingsleeve so as to entirely overlie the said radialpassage therein, and a. transmission-member interposed between the said locking-member and tripping-sleeve, having bodily and rotary movement in the said radial passage in the operating-sleeve, and being at all times confined in the said passage and covered by the overlying tripping-sleeve.`

2. A self-opening die-head having a body, chasers, an operating-sleeve therefor having a radial passage, a locking-member forhold'- ing the said operating-sleeve in position for maintaining the chasers in their cutting positions, a tripping-sleeve mounted for axial movement upon the said operating-sleevejso as to entirely overlie the said radial passage therein and having its inner periphery formed with a recess having a forward wall adjacent to the said passage in the voperating-sleeve, and a rotary and bodily-movable ball interposed between the said locking-member and tripping-sleeve and located inthe said radial passage and coacting with the inclined wall of the recess in the trippingsleeve which at y all times overlies and confines it.

In testimony whereof I have signed this specification.

ALBERT F. BREITENSTEIN. 

